Synergistic Inhibition of Carbon Steel Corrosion by Inhibitor-Blends in Chloride–Containing Simulated Cooling Water
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The objective of this work was to develop efficient synergistic inhibitor combinations comprising sodiumnitrite (NaNO2) and an inhibitor-blend code named (SN-50), keeping in view of their application in industrialcooling water systems. The electrochemical characteristics of the carbon steel working electrode in simulatedcooling water (SCW), without and with the addition of different combinations of the inhibitors, were investigatedusing electrochemical impedance spectroscopy (EIS), open circuit potential (OCP). The electrode surfacechanges were followed by visual characterization methods. It was demonstrated in this study that all thecombinations of the inhibitors exhibited synergistic benefit and higher inhibition efficiencies than did eitherof the individual inhibitors. The addition of SN-50 inhibitor to the SCW shifted the OCP to more anodicvalues and increased the polarization resistance (Rp) values of carbon steel at all applied concentrations. The higher the applied sodium nitrite concentration (in the protection concentration range), the higher theobtained Rp values and the inhibition efficiency improved by increasing the inhibitor concentration.
Abstract
The objective of this work was to develop efficient synergistic inhibitor combinations comprising sodiumnitrite (NaNO2) and an inhibitor-blend code named (SN-50), keeping in view of their application in industrialcooling water systems. The electrochemical characteristics of the carbon steel working electrode in simulatedcooling water (SCW), without and with the addition of different combinations of the inhibitors, were investigatedusing electrochemical impedance spectroscopy (EIS), open circuit potential (OCP). The electrode surfacechanges were followed by visual characterization methods. It was demonstrated in this study that all thecombinations of the inhibitors exhibited synergistic benefit and higher inhibition efficiencies than did eitherof the individual inhibitors. The addition of SN-50 inhibitor to the SCW shifted the OCP to more anodicvalues and increased the polarization resistance (Rp) values of carbon steel at all applied concentrations. The higher the applied sodium nitrite concentration (in the protection concentration range), the higher theobtained Rp values and the inhibition efficiency improved by increasing the inhibitor concentration.
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